To prevent the stray flux from passing into the steel enclosure two different methods of construction are employed in oil cooled reactors. The first consists of laminated core-plate about the winding to contain the flux (Magnetic shielding) and the second prevents the flux from entering the enclosure by providing a non-magnetic screen of aluminium surrounding the winding (Non-Magnetic shielding).

To prevent the stray flux from passing into the steel enclosure two different methods of construction are employed in oil cooled reactors. The first consists of laminated core-plate about the winding to contain the flux (Magnetic shielding) and the second prevents the flux from entering the enclosure by providing a non-magnetic screen of aluminium surrounding the winding (Non-Magnetic shielding).